Protector mechanism for looms



June 3, 1930. w. H. WAKEFIELD 1,760,971

' PROTECTOR MECHANISM FOR LOQMS I Filed Dec. 14, 1928 r subjected 1 tector dagger.

Patented June 3,1930

WALTER H. WAKEFIELD, or WORCESTER, MASSACHUSETTS,KASSIGNOR 'ro onoivrr'ron I & KNOWLES LOOM WORKS, MASSACHUSETTS.

nineteen filed December 14, 1928. Serial No. 325,988.

7 This invention relates to protector mechanisms for looms and'it is the general object of the'invention to 'sparethe protector finger'the twisting to'which it is ordinarily at the time "same time permit-the parts to remain in their properly adjusted position. l

The ordinary loomis provided with a pro- 'tector' r'o'd to which is usually welded a pro- The latter cooperates either with a knock-off lever or a frog, depending upon the type of loom, the protector finger. 'The finger is adapted for engagement with the shuttle binder.

The parts are so related that when a shuttle is properly boxed the protector finger, protector rod, and dagger will rock so that the latter will in its forward movement pass to one side of the knock-off lever or frog. When a shuttle is absent, however, the dagger is not moved and engages a loom stopping part to arrest movement of, the lay so that the warp may be protectedl.

In 'some'looms the relation} of the center of the lay,the axis of the protector rod, and the part with which the dagger cooperates is such that duringforward movement of the dagger at the time .of change in the angular relation between the 3o path of'movement' ofthe knockofi' 'leveror the arcuate movement through frog and which the-detecting mechanism moves, and

as a result the protector finger has a tendency to change its position with'respectito the protector rod."

- As. ordinarily constructed the protector finger isheldto the protector rod'in angular a set screw and it-is because of this construction that thefp'roteco'jtorfinger slips onthe protector rod." In or- Of e fin er adjustment by means of der to prevent movement *gularly on the rod it -hasbeen proposedito provide means for holding the protector finger in fixedangular relation with t hepro tector rod in such a way that'the finger can- I I I V rection of arrow'3,"Fig. 2, certain parts being 7 nots-lip; With such: a constructionit'isnot unusual to employ an adjustable screw in the top of the finger to engage the binder, the screw being movable so that the daggercan an be given its proper clearance-when the binder is pushed outby a boxed shuttle; such a construction prevents the hub of the protector-finger from moving angularly with of'knoclnoff and atthe and is positioned by protector faulty in protection there is a v fecting variations in the spring pressure.

threughaportion of the" loom showing my invention appliedto thelprotectorfinger, 11Tig. 2 is ade'tailedenla-r'ged front elevae V 'tiontaken int-hedirection-o'f arrow 2,*Fig. 1,

or wononsrnn', itAssAcnUsn'rTs, YA CORPORATION or.

rnorncron mnonnnisrr non LOOMS :WhiIe respect to theprotector rod-there is' neverthelessthe aforesaid tendency to change the shape of the upper part of the finger due to the changing angular relations between the protector mechanism and-the loom stopping element. I

In orderthat this last named strain may be relieved it has been proposed to put a spring between the protector finger andthe scre'wbut as previously made the-spring has been adjustable as to tension or compressiononly by changing the relative position of the binder engaging part of the screw andthe finger. Such constructions are that a variation in thespring pressure is accompanied by an undesired varia tion in the angular'relationbetween the effective part of the protector finger and the dagger. p '1 I It is an important object of my presentinvention to provide a protector finger having an adjustable screw which is held in position by a spring but wherein the latter is adjusted as to pressure through an additional element which preserves the proper angular relation between the dagger and the screw while ef- Vith these and other obj ects'in view which willappear as the description proceeds, my invention resides in the combination and arrangement of-parts hereinafter. described and set forth in the claimsl 1 j" V f In the: accompanying drawings wherein' a convenient embodiment of'm'y invention is set forth, i' V i Fig.1 is avvertical transverse section taken- Fig.3 is an end elevation taken in the'diin section 'toillustrate my -invention p Referring to Fig. I Lhav shown a iloom frame 10 having 'a breastbeam 11 to thejunder I side ofwhieh'is pivotedfor otherwise mo'unt the protector finger,

1 e r- .0 1 a. -rlarly as shown in Fig. 3 and hasthreaded'in ed for relative movement a knock-off lever 12. As shown herein said lever may move around a stud 13 which is fixed to the breast beam. The rear face of the lever is provided with a notch 14 adapted to receive a forward end of a dagger 15 fast with respect to a pro tector rod 16.

' The protector rod may be rotatablymounted in one or more bearings 17 mounted on" the lay substantially in the position shown in "Fig; 1. It is possible of course that the protector rod may be mounted elsewhere than in the particular location shown herein and I do not wish to be limited to the particular location of the knock-off lever rod-set forth. I

, The protector roclsmounted on the lay L or protector .;wh-ic h is supported by swords one of whichrocker, shaft 19.;theaxisof which is fixed the blow which the reed ives the cloth will be substantially perpendicular to the plane of the, latter, the cloth I being substantially lion/ e a Tghe matterthus far described is of comv.morrconstructionand forms no part of my present invention. It is found with such constructions inzcertain instances at least that because of the relation betweenthe ad- .vancing.end of the'dagger and the-rocker shaft '19 and because of the fact that the knock-off. lever= moves forwardly in a sub stantiallystraight line; the finger changes its angular relation during thetime that the dagger in the notch 1a with theresult that the ,protectorrod 16 tends to. rotate through 1 a sli ht angle with respect to the lay during protection. V Dly. :lnyention relates :more particularly to effect provide finger- 30 havinga hub 31 throughwhich extends a set screwBQ. The ,lat ter may be 181VGCl by a ratherilarge .notch33 forrne'd'in the protectorrod so that theangular position ofthe hub 31 with re .spectto the protectorrod 16 cannot easily ;be: disturbed and will remain substantially the-same throughout the operation of the 5-The fi11ger is formed .more particuthe upper d thereof a sleeve 34L extending towardthe'binderz' Sa d sleeve lshheld 1n position by lock nut 35 adapted to engage i ti; the-upper.partl ofthe finger'SQ. The sleeve tector fed through the rear and the parts carried thereby rand in carry ng my nvention nto has a smooth internal bore to receive a screw 36 and there is provided a lock nut 37 on the screw to engage the forward or left hand end as viewed in Fig. 3 of the sleeve 3%.

The rear end of the screw is provided with a head 38 adapted to engage the binder 21 and there is interposed between the rear of the sleeve 3% in the head 38 a compression spring '39 which tends to keep thescrew in rear position with respect to the protector finger. V

t is to be understood that there is some form of yielding device tending to hold the protector finger rearwardly and as shown herein such device may be a torsion spring 40 surrounding a portion of the rod 16 and having one end operatively related to the dagger and the other end located under the vlay L. The effect of the spring 40 15 to 11ft the dagger 15 so that the same will be normally positioned to enter the notchll unless the shuttle acts through the protector finger to move the dagger downwardly against the action of spring 40. As inpreviously proposed constructions it is'necessary that the spring 39 exert a somewhat greater pressure than. that exerted by spring 40 so that out ward movement of the binder will effect a corresponding movement of the protector finger and dagger.

Thereis ordinarily only a limited amount of space in which the spring 39 may be located. It is necessary of course that the spring 39 be sufiiciently expanded so that it can yield during theaction ofprotection,' but it must bestiif enough, as previously stated, to overpower thetorsion spring 40. It is desirable to have some form of adjustment which willpermit-the proper tensioning of spring 39 to accommodate these'diiferent conditions but in varying the pressure of the spring 39 the angledefined by the daggerand a line extending from the axis of the proace of the head 38 should not be changed This condition is Hefi'ectedby the construction set forth herein.

In operation, at the time of protection, the

' binder will be in its rearward position, that is; to the right of the positionshown in Fig. l, with the result that the dagger 15 willbe raised to enter'the notch 14. As the lay continues to move forwardly'during the knocking-oif of the loom the spring 39 willbe com-. pressed due to the previously mentioned changing angularrelation between the proftector devices andthe path ofmovement of the lever 12. In this way the protector finger 80 is not acted upon by any force su clently strong eitherv to alter its shape'or to change, its angularrelation with the pro-- -tector rod 16. r

- Due to variations'in the picking oflthe loom the weaver or loom fixer will occasionally. change the shape of the binder. Any wearioni the part of the rocker shaft 13 will compression spring also result in a slight downward'movement of the lay and for theseand possible other reasons it may become necessary from time to time to change the protector finger .or that part which engages the binder. Thisv can be effected by loosening the check nut 37 and moving the head 38 of the screw to the proper position so that when a shuttle is properly boxed the dagger 15 'Wlll just clear the notch 14 asthe lay moves forwardly.

If it be foundthat' the new setting of the, screw permits too great expansion of the spring 39 the lock nut35 can be released and the sleeve moved rearwardly to 'bring'about the correct compression of the spring 39.

With this adjustment it will of course be necessary to move the screw 36 forwardly an amount equal to the rearward movement of the sleeve, but this can readily be accomplished by the lock nut37. i

From the foregoingit will be seen that I have provided a protector mechanism wherein the finger may beheld against angular movement with respect to the protector rod and that the screw which engages the binder may be kept in its proper angular position with respect to the dagger even though the spring 39 be subject to adjustment By the construction set forth the tendency to alter the shape or change the angular position of the finger with respect to the protector rod is obviated in a way that will permit the correct positioning of the adjustable element on the protector finger with respect to the binder. 1

Having thus described my invention it may be made therein by those skilled in the art without departing from the spirit and scope limited to the details herein disclosed, but what-I claim is: r a 7' 1. In protector mechanism fora loom having a shuttle binder and a'protector rod,"a sleeve threaded in the protector finger, a screw slidable through the sleeve and adapted for engagement with'the binder, and a.

located between the sleeve and that portionof the screw'which engages the binder.

2. In protector mechanism for a loom having a shuttle binder and a protector rod, a

sleeve threaded in the binder finger and lcapableof assuming a plurality of longitudinal positions with respect to thefinger, a screw slidable through the sleeve, ahead formed the binder, and a compression sprlng located ving .ing its support from sleeve, and a resilient device acting on the binder engaging element to permit yielding of the elementin the direction inwhich the binder moves when advancing, said yielding element being positioned by the sleeve.

7 4C. In protector mechanism for a loom hava shuttle binder anda protector rod, a sleeve threaded binder, a binder engaging element slidably mounted in the sleeve, and a yielding device interposed between the sleeve and the binder engaging element tending to hold the latter toward the movement of the element with respect to the 5. In a vprotector mechanism fora loom having a shuttle binder and a protector rod, a protector finger,

the finger and adapted for engagement. with device tending to hold the element toward through the protector finger andvhavi'ng an axis projecting toward the binder by permitting forward a movable element derivthe binder, a yielding:

the binder, and a supporting member interposed between the movable element and the protector finger and effective to move the ele-' respect. to thefinger and Y ment bodily with having engagement with the yielding device.

In testimony whereof I have hereunto affixed signature.

' WALTER H., WAKEFIELD.

V will be seen that changes and modifications of the invention and I do notwish to be 7 on the screw adapted for engagement with i V between the sleeve and the headand tending to hold the latter toward the binder.

3. In protector mechamsm for a loom hav} ing a shuttle binder and a protector rod, a

sleeve threaded through the protector finger:

v and movable towardand from thebinder, a binder engaging element slidable through the 

